NFL.com's Ian Rapoport reported that the San Francisco 49ers wide receiver suffered a torn Achilles tendon during organized team activities Tuesday, according to a person informed of the injury.

Crabtree already has had surgery to repair his torn Achilles, according to Rapoport. Crabtree now begins an estimated six months of rehab, according to Rapoport, which means the receiver could return as early as November.

It's a brutal development for the 49ers, who watched Crabtree bloom into a Pro Bowl-level receiver in his fourth NFL season. Crabtree set career highs in receptions (85), yards (1,105) and touchdowns (nine). His production took off after Colin Kaepernick replaced Alex Smith as the starting quarterback.

If there's a silver lining for the 49ers, it's the progress that has been made in the treatment of this type of injury. An Achilles tear once was an instant season-ender, but that has changed in recent times.